Low permeable oil deposit virtual horizontal well development method

Abstract

The invention relates to a low permeable oil deposit virtual horizontal well development method, comprising the following process technologies: deploying a developed well pattern, early flooding under nearly high pressure condition, optimizing a perforation well section and a perforation way, designing and deploying the development technology and producing a long slot by ultra large scale fracturing. When the developed well pattern is deployed, the well pattern is designed and deployed in a region with the thickness of an oil layer being higher than a 4m line, the well pattern is a five-spot square one with the distance between an oil well row and a water well row being 490-520m and the distance between an injection well row and an extraction well row being 170-200m, wherein the directionof the oil well row and the water well row is consistent with the direction of the main geostatic stress; the early flooding is carried out under the nearly high pressure condition that the strata pressure coefficient is kept to be 0.9-1.0; at the middle part of the oil layer is perforated for only 2-4 meters, and the perforating is carried out by adopting a multiphase optimized perforation way; the development technology is designed and oil-water wells and capacities of the oil-water wells are deployed in a block; and the slot is produced by adopting the ultra large scale fracturing while monitoring is carried out, wherein average length of half slot is 190-250m, and high delivery volume construction at the speed of high quality fracturing fluid being 5-6m<3>/min is adopted in the whole course. The invention is applied to a low permeable oil deposit development process.

Description

1. Technical field [0001] The invention relates to the development and production technology of petroleum low-permeability reservoirs, in particular to a development method of low-permeability reservoirs imitating horizontal wells. 2. Background technology [0002] Conventional development mode of petroleum low-permeability reservoirs: the well spacing is generally tens to hundreds of meters, the well type generally adopts vertical wells or a combination of vertical wells and horizontal wells, and the production measures are acidizing or small-scale fracturing etc., implement water injection development when the formation pressure coefficient drops to about 0.9; this development mode has played a certain role in the development of low-permeability oil reservoirs, but at the same time there are the following shortcomings or deficiencies: During the process, the waterline breakthrough is fast, the water breakthrough is fast, the oil displacement efficiency is low, and the deve...

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Problems solved by technology

[0002] Conventional development mode of petroleum low-permeability reservoirs: the well spacing is generally tens to hundreds of meters, the well type generally adopts vertical wells or a combination of vertical wells and horizontal wells, and the production measures are acidizing or small-scale fracturing etc., implement water injection development when the formation pressure coefficient drops to about 0.9; this development mode has played a certain role in the development of low-permeability oil reservoirs, but at the same time there are the following shortcomings or deficiencies: During the process, the waterline breakthrough is fast, the water breakthrough is fast, the oil displacement efficiency is low, and the development effect is poor; ②The large well spacing well pattern is limited by the original process transformation technology, etc. Generally, the half-fracture length of vertical well fracturing is about 100m, and the half-fracture length of horizontal well fracturing At about 120m, it is difficult to establish an effective driving pressure difference. After several years of development, most wells are in a state of shutdown or semi-shutdown; ③The investment in developing a million-ton production capacity is more than 5.3 billion yuan, with poor economic benefits and high development investment

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